CVE-2021-47294
published 2024-05-21CVE-2021-47294: In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch…
PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.28%
19.8th percentile
In the Linux kernel, the following vulnerability has been resolved:
netrom: Decrease sock refcount when sock timers expire
Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use
sock timer API. It replaces mod_timer() by sk_reset_timer(), and
del_timer() by sk_stop_timer().
Function sk_reset_timer() will increase the refcount of sock if it is
called on an inactive timer, hence, in case the timer expires, we need to
decrease the refcount ourselves in the handler, otherwise, the sock
refcount will be unbalanced and the sock will never be freed.
Affected
33 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.14.6-1 (bookworm) | linux 5.14.6-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 0adf571fa34b27bd0b97b408cc0f0dc54b72f0eb < 48866fd5c361ea417ed24b43fc2a7dc2f5b060ef | 48866fd5c361ea417ed24b43fc2a7dc2f5b060ef |
| linux | linux | >= 2c6b572458a9127e8070df13fa7f115c29ab1d92 < 9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950 | 9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950 |
| linux | linux | >= 3.18.134 < 3.19 | 3.19 |
| linux | linux | >= 4.14.98 < 4.14.241 | 4.14.241 |
| linux | linux | >= 4.19.20 < 4.19.199 | 4.19.199 |
| linux | linux | >= 4.20.7 < 4.21 | 4.21 |
| linux | linux | >= 4.4.173 < 4.4.277 | 4.4.277 |
| linux | linux | >= 4.9.155 < 4.9.277 | 4.9.277 |
| linux | linux | >= 63346650c1a94a92be61a57416ac88c0a47c4327 < 25df44e90ff5959b5c24ad361b648504a7e39ef3 | 25df44e90ff5959b5c24ad361b648504a7e39ef3 |
| linux | linux | >= 63346650c1a94a92be61a57416ac88c0a47c4327 < 6811744bd0efb9e472cb15d066cdb460beb8cb8a | 6811744bd0efb9e472cb15d066cdb460beb8cb8a |
| linux | linux | >= 63346650c1a94a92be61a57416ac88c0a47c4327 < bc1660206c3723c37ed4d622ad81781f1e987250 | bc1660206c3723c37ed4d622ad81781f1e987250 |
| linux | linux | >= 63346650c1a94a92be61a57416ac88c0a47c4327 < 517a16b1a88bdb6b530f48d5d153478b2552d9a8 | 517a16b1a88bdb6b530f48d5d153478b2552d9a8 |
| linux | linux | >= baa9e32336bf6d0d74a7c3486d2a27feaf57cd5f < a01634bf91f2b6c42583770eb6815fb6d1e251cf | a01634bf91f2b6c42583770eb6815fb6d1e251cf |
| linux | linux | >= ce29e8a259de767f7210d346ad2b031cb8ab2732 < 853262355518cd1247515b74e83fabf038aa6c29 | 853262355518cd1247515b74e83fabf038aa6c29 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.70-1 | 5.10.70-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
vendor_ubuntu5.5MEDIUM
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Ubuntu
Linux kernel (FIPS) vulnerabilities
vendor_ubuntu·2025-11-10·CVSS 5.5
CVE-2025-38617 [MEDIUM] Linux kernel (FIPS) vulnerabilities
Title: Linux kernel (FIPS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- HSI subsystem;
- Media drivers;
- Network drivers;
- Ethernet team driver;
- TTY d
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2025-11-06·CVSS 5.5
CVE-2024-50299 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- DMA engine subsystem;
- GPU drivers;
- HSI subsystem;
- Ethernet team driver;
- TTY drivers;
- Ext4 file system;
- Timer subsystem;
- DCCP (Datagram Co
Red Hat
kernel: netrom: Decrease sock refcount when sock timers expire
vendor_redhat·2024-05-21·CVSS 5.5
CVE-2021-47294 [MEDIUM] CWE-401 kernel: netrom: Decrease sock refcount when sock timers expire
kernel: netrom: Decrease sock refcount when sock timers expire
In the Linux kernel, the following vulnerability has been resolved:
netrom: Decrease sock refcount when sock timers expire
Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use
sock timer API. It replaces mod_timer() by sk_reset_timer(), and
del_timer() by sk_stop_timer().
Function sk_reset_timer() will increase the refcount of sock if it is
called on an inactive timer, hence, in case the timer expires, we need to
decrease the refcount ourselves in the handler, otherwise, the sock
refcount will be unbalanced and the sock will never be freed.
A vulnerability was found in the Linux kernel's NetRom subsystem. This issue arises when socket timers expire, if the timer handler does not decrease the socket referen
Debian
CVE-2021-47294: linux - In the Linux kernel, the following vulnerability has been resolved: netrom: Dec...
vendor_debian·2021·CVSS 5.5
CVE-2021-47294 [MEDIUM] CVE-2021-47294: linux - In the Linux kernel, the following vulnerability has been resolved: netrom: Dec...
In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.
Scope: local
bookworm: resolved (fixed in 5.14.6-1)
bullseye: resolved (fixed in 5.10.70-1)
forky: resolved (fixed in 5.14.6-1)
sid: resolved (fixed in 5.14.6-1)
trixie: resolved (fixed in 5.14.6-1)
OSV
linux-fips vulnerabilities
osv·2025-11-10·CVSS 5.5
CVE-2025-40300 [MEDIUM] linux-fips vulnerabilities
linux-fips vulnerabilities
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- HSI subsystem;
- Media drivers;
- Network drivers;
- Ethernet team driver;
- TTY drivers;
- Framebuffer layer;
- BTRFS file system;
- Ext4 file system;
- Network fi
OSV
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
osv·2025-11-06·CVSS 5.5
CVE-2025-40300 [MEDIUM] linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered
that the Linux kernel contained insufficient branch predictor isolation
between a guest and a userspace hypervisor for certain processors. This
flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this
to expose sensitive information from the host OS. (CVE-2025-40300)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- DMA engine subsystem;
- GPU drivers;
- HSI subsystem;
- Ethernet team driver;
- TTY drivers;
- Ext4 file system;
- Timer subsystem;
- DCCP (Datagram Congestion Control Protocol);
- IPv6 netwo
OSV
CVE-2021-47294: In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netro
osv·2024-05-21·CVSS 5.5
CVE-2021-47294 [MEDIUM] CVE-2021-47294: In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netro
In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.
GHSA
GHSA-wc9c-rv2v-442r: In the Linux kernel, the following vulnerability has been resolved:
netrom: Decrease sock refcount when sock timers expire
Commit 63346650c1a9 ("net
ghsa_unreviewed·2024-05-21
CVE-2021-47294 [MEDIUM] CWE-672 GHSA-wc9c-rv2v-442r: In the Linux kernel, the following vulnerability has been resolved:
netrom: Decrease sock refcount when sock timers expire
Commit 63346650c1a9 ("net
In the Linux kernel, the following vulnerability has been resolved:
netrom: Decrease sock refcount when sock timers expire
Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use
sock timer API. It replaces mod_timer() by sk_reset_timer(), and
del_timer() by sk_stop_timer().
Function sk_reset_timer() will increase the refcount of sock if it is
called on an inactive timer, hence, in case the timer expires, we need to
decrease the refcount ourselves in the handler, otherwise, the sock
refcount will be unbalanced and the sock will never be freed.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060efhttps://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8ahttps://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cfhttps://git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060efhttps://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8ahttps://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cfhttps://git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250
2024-05-21
Published